JP3184410B2 - Color picture tube equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube having a built-in in-line type electron gun, a self-convergence type deflection yoke mounted on the color picture tube, and an electron gun side end of the deflection yoke. A pair of E-shaped or U-shaped cores symmetrically arranged in the vertical and horizontal directions, auxiliary coils wound on both cores, and a control circuit for dividing a vertical deflection current in the auxiliary coils. The present invention relates to a color picture tube device comprising:

[0002]

2. Description of the Related Art In general, a self-convergence type deflection yoke is mounted on a color picture tube having a built-in in-line type electron gun. Generates a distorted vertical deflection magnetic field. If the vertical deflection magnetic field and the color picture tube are relatively axially offset in the left-right direction,
Misconvergence of the pattern as shown in FIG. 3A or 3B (hereinafter abbreviated as misalignment of the axis) occurs. That is, among the three electron beams emitted from the electron gun for emitting blue, green and blue light, the blue and red horizontal lines B and R projected on the upper and lower portions of the screen 1 by the electron beams on both sides are formed. Separate outward or inward from each other.

[0003] When such a phenomenon occurs, the color purity is lowered. Conventionally, as shown in FIG. 4, damping resistors 3a and 3b are connected in parallel to a pair of vertical deflection coils 2a and 2b via a variable resistor 4. Connected to With such a circuit configuration, the magnitude of the vertical deflection current flowing through each of the pair of left and right vertical deflection coils 2a and 2b can be finely adjusted by the variable resistor 4, so that misalignment misalignment can be corrected.

[0004]

However, the correction of the misalignment by the circuit constructed as described above is performed by simultaneously and equally setting the blue and red horizontal lines B and R at the upper and lower portions of the screen 1. Will be moved. Therefore, misconvergence cannot be corrected when the vertical deflection magnetic field and the color picture tube are relatively displaced in the rotational direction. In other words, when the vertical deflection magnetic field and the color picture tube are relatively displaced in the rotational direction,
Since misconvergence of the pattern shown in FIG. 5A or 5B (hereinafter abbreviated as “rotational misconversion”) occurs, the rotational misconversion cannot be corrected by the circuit configuration shown in FIG. Further, since the left-right asymmetry of the vertical deflection magnetic field increases as the differential component of the pair of vertical deflection coils 2a and 2b increases, trapezoidal distortion as shown in FIG. Are more likely to occur on the screen 1.

[0005] Therefore, an object of the present invention is to separate an axis misalignment as shown in FIG. 3 or a rotation misconductor as shown in FIG. 5 at the upper and lower portions of the screen without causing trapezoidal distortion as shown in FIG. It is an object of the present invention to provide a color picture tube device which can correct the color picture.

[0006]

According to the present invention, there is provided a color picture tube having a built-in in-line type electron gun, and a self-convergence type deflection mounted on the color picture tube. A yoke, a pair of E-shaped or U-shaped cores symmetrically arranged vertically or horizontally at the end of the deflection yoke on the electron gun side, an auxiliary coil wound around each of the cores, A control circuit for shunting the vertical deflection current to the auxiliary coil, the control circuit comprising: a series connection of two resistors connected in series to the vertical deflection coil of the deflection yoke; A diode bridge circuit connected to the diode bridge circuit, wherein two of the four diodes of the diode bridge circuit that allow the positive half cycle component of the vertical deflection current to flow through the first variable resistor And are connected in series, two diodes for flowing the negative half-cycle component of the vertical deflection current is connected in series through the second variable resistor, and first
And a movable electrode of the second variable resistor connected to an intermediate connection point of the series connection body via the auxiliary coil.

[0007]

Since the present invention is constructed as described above, by selectively sliding the movable electrodes of the first and second variable resistances, the positive half cycle component and the negative half cycle component of the vertical deflection current are obtained. For each of the components, the direction and magnitude of the current shunted to the auxiliary coil can be adjusted.
Then, a quadrupole magnetic field for misconvergence correction is generated by the current shunted to the auxiliary coil, so that the misconvergence in each of the upper and lower portions of the screen is individually corrected without largely destroying the left-right symmetry of the vertical deflection magnetic field. It is possible to do.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, an in-line type electron gun 5
Is mounted with a self-convergence type deflection yoke 7, and a pair of upper and lower saddle type horizontal deflection coils 8a and 8b of the deflection yoke 7 have a horizontal deflection magnetic field distorted like a pincushion. Occurs. The pair of left and right saddle type vertical deflection coils 9a and 9b generate a vertical deflection magnetic field distorted in a barrel shape.

A pair of vertical deflection coils 9a and 9b are composed of two pairs of vertical coma aberration correcting coils 10a, 10b, 11a,
11b and a control circuit 12 are connected to a vertical deflection current supply circuit (not shown). The control circuit 12 includes two resistors 13 connected in series to the pair of vertical deflection coils 9a and 9b.
a, 13b, and a diode bridge circuit 14 connected in parallel with the series connection 13. The two resistors 13a and 13b have the same resistance value. Of the four diodes 15 to 18 of the diode bridge circuit 14, two diodes 15 and 16 for passing the positive half cycle component of the vertical deflection current are connected in series via a first variable resistor 19. The two diodes 17 and 18 for passing the negative half cycle component of the vertical deflection current are connected in series via a second variable resistor 20. Then, the first and second variable resistors 19,
Each of the 20 movable electrodes is connected to an intermediate connection point 23 of the series connection body 13 via a pair of auxiliary coils 21 and 22.

As shown in FIGS. 2A and 2B, a pair of E-shaped cores 24 and 25 are symmetrically arranged above and below an end of the deflection yoke 7 on the electron gun 5 side. Both cores 24, 25
Each of the center legs 24a, 25a has a pair of auxiliary coils 2
1 and 22 are wound respectively. Then, a quadrupole magnetic field indicated by a solid arrow is generated by dividing the vertical deflection current into the auxiliary coils 21 and 22.

That is, as shown in FIG. 2A, when the center legs 24a and 25a of both cores 24 and 25 are both magnetized to N poles, three electron beams b emitted from the electron gun 5 are emitted. , G, and r, vertical forces Fb and Fr act on the electron beams b and r on both sides, respectively. Also, as shown in FIG. 2B, the center legs 24a, 25a
Are magnetized to the S pole, forces Fb and Fr in the opposite directions act on the electron beams b and r on both sides, respectively.

When the movable electrode of the first variable resistor 19 is slid toward the terminal a, the positive half-cycle component of the vertical deflection current is converted to the diode 15, the first variable resistor 19, and a pair of auxiliary coils. 22 and 21 and the resistor 13b. Therefore, a quadrupole magnetic field shown in FIG. 2A is generated, and an upward force Fb acts on the blue light-emitting electron beam b, and a downward force Fr acts on the red light-emitting electron beam r. It is possible to correct the rotational miscon shown in FIG.

When the movable electrode of the first variable resistor 19 is slid toward the terminal b, the positive half cycle component of the vertical deflection current is converted into the resistance 13a and the pair of auxiliary coils 21 and 2.
2. The current is shunted through the first variable resistor 19 and the diode 16. In other words, the directions of the currents flowing through the pair of auxiliary coils 21 and 22 are opposite to those described above, so that a quadrupole magnetic field shown in FIG. 2B is generated, and a downward force is applied to the blue emission electron beam b. Fb and the upward force Fr act on the electron beam r for red light emission, respectively, and can correct the rotational miscon shown in FIG. 5B.

When the movable electrode of the first variable resistor 19 is at an intermediate position between the terminals a and b, the pair of auxiliary coils 2
No current flows in the first and second 22 and no quadrupole magnetic field is generated. As described above, the rotation miscons at the upper part of the screen 1 is changed to the screen 1
Irrespective of the lower part of the image, it can be finely corrected by a necessary amount. In addition, the rotational miscons at the lower part of the screen 1 can be corrected in the same manner as described above irrespective of the upper part of the screen 1 by slidingly adjusting the movable electrode of the second variable resistor 20.

When the inductance of the vertical deflection system is 5 mH, the number of turns of each of the correction coils 21 and 22 is set to 40, the resistance of each of the resistors 13a and 13b is set to 1.5Ω, and each of the variable
The maximum resistance value of 9, 20 can be set to 10Ω. In this case, the electron beam r for red emission is moved upward and downward with respect to the electron beam b for blue emission ±
The movement can be adjusted with a width of 0.5 mm, whereby the misalignment of the axis and the rotation of the axis can be almost completely corrected.

In the above embodiment, a pair of cores 24, 25
Although an E-shape is used for this, when a U-shape is used, an auxiliary coil can be wound so as to straddle both legs. Further, both cores may be symmetrically arranged on the left and right sides of the electron gun side end of the deflection yoke.

[0018]

As described above, according to the present invention, a quadrupole magnetic field for misconvergence correction is generated for each of the positive half cycle component and the negative half cycle component of the vertical deflection current,
For this purpose, the direction and magnitude of the current shunted to the auxiliary coil can be finely adjusted by a variable resistor. And rotation misconduct can be corrected.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a main part of a color picture tube device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a magnetic field for misconvergence correction in one embodiment of the present invention.

FIG. 3 is a diagram showing a pattern of misconvergence caused by axis misalignment.

FIG. 4 is a circuit diagram of a conventional circuit for correcting misconvergence caused by axis deviation.

FIG. 5 is a diagram showing a pattern of misconvergence caused by rotational displacement.

FIG. 6 is a diagram showing a trapezoidal distortion pattern;

[Explanation of symbols]

 Reference Signs List 6 color picture tube 7 deflection yoke 9a, 9b vertical deflection coil 12 control circuit 13a, 13b resistor 14 diode bridge circuit 15-18 diode 19,20 variable resistor 21,22 auxiliary coil 24,25 core

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/76 H04N 9/28

Claims (1)

(57) [Claims] 1. A color picture tube having a built-in in-line type electron gun, a self-convergence type deflection yoke mounted on the color picture tube, and a vertical or horizontal symmetry of the electron gun side end of the deflection yoke. A pair of E-shaped or U-shaped cores arranged in a parallel manner, an auxiliary coil wound around each of the cores, and a control circuit for shunting a vertical deflection current to the auxiliary coil. Has a series connection of two resistors connected in series to the vertical deflection coil of the deflection yoke, and a diode bridge circuit connected in parallel to the series connection. Among the diodes, two diodes for passing the positive half cycle component of the vertical deflection current are connected in series via the first variable resistor, and the diodes for passing the negative half cycle component of the vertical deflection current flow. Two diodes to be connected are connected in series via a second variable resistor, and each movable electrode of the first and second variable resistors is connected to an intermediate connection point of the series connection body via the auxiliary coil. A color picture tube device characterized by being made.